Roasting-furnace.



PATENTED MAB.. .8, 1904.

SLD. CRAIG., G. L. KELLY & W. TURNER.

ROASTING PURNAGL.

No.' '754,199 Y PATENTED MAB.. 8, 1904.

S'. D. CRAIG, G. E. KELLY L W. TURNER.

ROASTING FURNACE.

APPLICATION FILED JUNE 18, 1903. N0 MODEL. 4 SHEETS-SHEET 3.

Y '5y @m No. 754,199. y PATRNTRD MAR. 8, 1904..

s. D. CRAIG, G. R. KELLY L W. TURNER.

ROASTING FURNACE.

APPLIOATIOR FILED JUNE 1a, 1903.

No MODEL. 4 sHBBTs-sHRET 4.

f/m/ @WW i e AM r A:Patented March 8, 1904.

UNITED STATES4 PATENT GEEICE.A

SAFORD vD. CRAIG, GUY ELMER KELLY, AND WTLLIAM TURNER, OF LAHARPE, KANSAS.

ROASTI NG-FU RNACE i SPECIFICATION forming part of Letters 'Patent No. 754,199, dated March 8, 1904. Application filed June 18, 1903. lSerial N0. 162,016. (No model.)

To all whom z'zL may concern,.-

Be it known that we Savronn D. CRAIG, GUY ELMEP. KELLY, andWrLLIAM TURXEP.. citizens of the United States, and residents of Laharpe, in the county of Allen' and State of Kansas, have invented a new and Improved Roasting-Furnace, of which the-following is a full, clear, and exact description.

This invention relates to improvements in ore-roasting furnaces or kilns. an object be ing to provide a furnace in which ores ma)v be rapidly and thoroughly roasted while being agitated by an automatically-controlled device. v

.XVe will describe a roasting-furnace embodying our invention and then point out the novelfeatures in the appended claims.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indil cate corresponding parts in all the iigures ,'10 is a plan view thereof.

The furnace comprisesa long casing or shell having side walls 'and va bottom wall 6, said bottom wall 6 'being inclined downward from one end to the other 4and resting on a bed 7, of dirt or other suitable material. Arranged at the upper end is an arched top plate 8, and-i below this plate 8 or toward the outlet end of the furnace are arched plates 9 10, which form not only the top walls of the furnace, but the bottom walls of ues 1l 1Q, the top wall of the flue being indicated at 13. This flue lcornmunicates withy a cross-flue 14, which ends in -asmokestack 15. The lower arched plate 10 is also provided with openings 16, which provide communication between the furnace and said cross-nue 14. It will be noted that the arched or flue plates 8,9 10 areof different lengths and on .dierent horizontal planes- Fig. 3 is.

doors 27.

that is, the plate 9 is below the plane of the plate 8, while the plate 10 is below the plane of the plate 9. By this construction three diiferent temperatures are maintained in the furnace. 'Baile-plates 9a 10a, depending from the plates 9 10. serve to check the heat and direct it into the iiues.

The furnace is suitably braced by vertical side rails 1T 1i'El and by top cross-rails 18 18a.

Extended along the top of the furnace 'and connected at its ends to uprights at the ends thereof is an expansion-rod 19, designed to brace the furnace against expansion and contraction lengthwise. At suitable intervals the side walls of the furnace are provided with openingsy :'20, through which an instrument -may be passed for cleaning the interior of the furnace or forotlier purposes. These openings, however, will be normally closed by removable brick.

Arranged along the sides of the furnace are lire-boxes -21, which ofcourse are "provided with suitable doors. Four iire-boxes are here shown; but the number may be varied without departing from the spirit of the `invention. The products of combination pass from the {ire-boxes into the furnace through thel throats QQ, 'and products of combustion pass into the iiues'll 12 through the spaces 23 2-1. Extended. along the floor of the furnace at opposite sides are track-rails' 25, preferably consisting of plates of brick or other refractory` material. As indicated in F ig. 4, these track-rails arev mounted 'on .brickwork 26,

which is stepped on' the under side. Atthe upper end there are a number of swinging These doors are mounted to swing on a rod attached to the under side of a brick bar 28, and at the lower end there are. similar swinging doors 29, but of course somewhat longer than the doors Q7. because of the difference in distance atl the opposite ends between theiioor of the furnace and the arched plates. These doors areto permit the passing in and out ofthe agitating device, to be hereinafter described, so that when the agitating device passes in the doors will immediately close, so that a draft will be maintained thrugh the furnace. The'liangers for the Vdoors are protected from undue strain by delrail 30 andthe track-rails.

' The agitating device will now be described.

r1 his agitating device consists of a 'carriage formed of a frame 31, mounted on wheels 32,

which engage with the track-rails 25. Mountto swing on the frame 31 is an agitator or scraper carrying frame consistingof the side bars 33 and end bars 34. As here shown,

the said-frame is rigidly secured to a shaft swing on a rod 42, attached to the frame 31,'

35, mounted to swing in bearings on the `frame 31. Also rigidly attached to this shaft is a wheel 36, having three notches 37 38 39, in any one of which a lug 40 on a. lever 41 may engage. The said lever is mounted to and at its free end it is provided with a weight 43. The end opposite the weight 43 is-curved upward, as indicated at 44. Extended from the shaft 35 is an arm 45 carrying a pulley 46, andalso arranged on the shaft at 'an angle with relation to thev arm 45 is another arm 47. O n diagonally opposite corners of the agitator-frame are downward]y-extended hangers supporting rollers 48, the purpose of which will be hereinafter described. Attached 'to one end bar 34 are two sets of agitating-plates 49 50, the said plates being extended diagonally across the bar and the outer ends of one set of plates converging toward the outer ends of theother set of plates. On the other bar 34 are also two sets of agitating-plates 51 52, the outer 'ends of the sets being convergent, land theplates of t-he sets 51 52 are placed at a reverse angle to the plates 49 50,

las clearly indicated in Fig. 10. By this' arrangement it is obvous that as lthe device moves in one direction through. the furnace theplates 49 50 will cause the ore to be scraped or moved toward the center of the furnace and when moved in the opposite direction the Scrapers 51 52 will cause an outward movement of the ore, and thus it will pulley 59, these pulleys being designed to be engaged with a belt driven from any desired source.

In the operation it will be understood that the. agitating device moves downward by gravity, because at this time the driving-band will be on the loose pulley 5g, and during this movement it does no work, because the scraping devices at both ends will be in elevated position, as indicated in Fig. 6. To bring the vparts to' this position, as the carriage 65 tion of the lever passes the bar 60 the lug will drop into the central notch 38, thus holding the parts in their upper position. The device will now pass down through the furnace, and when it passes out of the lower door the curved portion of the lever 44 will be raised the lug 40 from the central notch. The arm 47 next engages with a shoulder 63 on a swing;y ing bar 64, causing the agitator-frame tov swing to move .the upper set of Scrapers 49 50' to lowered position to engage in the ore, thisy position being indicated in Fig. 7. As the frame is thus rockedthe lug 40 will drop into the notchv 37. As the carriage starts on its upward trip the pulley 46 will engage with the inclined end of the bar 64 and elevate the same, permitting the curved end 44 of the lever 41 to pass underneath the cross-bar 62. After the carriage shall have again left its uppermost position, with the scraper-plates in the condition indicated in Fig. 6the said `carriage inpassing out of the lowe door will pass underneath the bar or lever 4 and also the arm 47 will pass underneaththe shoulder 63, so that by the next return motion the said arm 47 will engage with the outer side of said shoulder 63, rocking the lower set of scraperplates 51 52 into operative position, where they will be held by the lug 40 engaging in the notch 39. i

Of course during the several movements of the agitator through the furnacethe products of combustion will be passing rapidly and freely through the furnace.

y To preventlateral movement of the carriage with relation to the rails 25, it is provided at its sides with rollers 65, which engage against the sides of the furnace.

Having thus described our invention, we claim as new and desire to secure by Letters Paten-t 1. Aroasting-furnace comprisinga long cas ing having a downwardly-inclined floor, a series of arched roof-plates arranged at diiferent horizontal planes, a flue leading to an uptake, certain of said plates forming the bottom walls of said line, an agitator, and means for causing said agitator to move through the' furnace.

2. A roasting-furnace having a downwardlyinclined floor, arched roof-plates of .different lengths and arranged on different horizontal planes, a plurality of fire-boxes arranged on opposite sides of the furnace and communiby engaging with a cross-bar 62, releasing 80` IOO IIO

` inclined bottom wall or oor. a series of arched roof-plates, 'a ue. certain of said plates forming the bottom walls of said line.| fireboxes communicating with the interior lof the furnace, the side walls of said furnace being provided with openings 'having removable doors'or closures, swinging doors at the ends of the furnace. an agitating device movable through the furnace. and means for causing the movement of said device upward on the inclined door. the movement of said device downward being by gravity.

4. A furnace comprising a long casing. having an inclined door, track-rails extended along the door. a carriage movable on said track-rails. a swinging frame on said carriage. means for locking the frame in itsl adjused position. means for releasing the locking devioe, and agitator-plates on opposite ends of said swinging frame.

5. A furnace com-prising a long casing having an inclined floor.` track-rails on said floor, a carriage mounted on rails. a frame mounted .to swing on the carriage.; two sets of scraper-plates arranged on each end of said swinging frame. the plates of the series at the ends being at reverse angles. the plates at one end being at reversed angles to the plates of the other vends. means for holding the plates at one -end in'lowered position while holding the plates at the other end in Aan upper position. and means for reversing the positions.

6. A furnace havingan inclined door. trackrails on the door. swinging doors at the opposite `ends of the fnrnacereach door. consisting of a plurality oisections, a carriage movable along said track-rails, a shaft at the upper. end of the furnace. sheaveson said shaft, cable connections between the carriage and sheaves. a swinging frame on the carriage,

and agitator-plates on opposite ends of said 7. The combination with a furnace having an inclined bottom wall, of an lagitator mov'- able through the furnace.- the said agitator comprising a carriage, a frame mounted rock on the carriage, a notched wheel on the shaft of said frame. diagonally-arrangui agitatng-plates on opposite ends of the frame.v a swinging lever having a lug to engage in any one of the notches of the said wheel, and means for swinging said lever to move the lug out of the notch.

8. The combination with a furnace having an inclined oor, of a carriage movable along said door. a frame mounted to s v on the carriage. diagonally-disposed agitating-plates on the front and rear 'ends of said frame. means for holding the frame with either setof agitators in operative position. means for holding both sets of agitators ont of operative position, and means for drawing the carriage up 'the incline.

' 9. A furnace an inclined bottom wall, track-rails arranged on said bottom wall1 abar arranged along the oor between the rails, a carriage movable ou said track-rails scrapers mounted on the carriage for forcing material toward said center rail, and agitators on the carriage for moving material outward from said center rail.v

10. The combination with a furnace and an agitator movable therethrough, of a trip mechanism for the agitator at oneend of the furnace` comprising a swinging lever, a crossbar carried by the lever, means for limiting the downward movement of said lever. and

means for holding said lever in elevated position.

In testimony whereof we have signed our names .to this specification in the presence of two subscribing witnesses.

' SANFORD D. CRAIG.

GUY ELMR KELLY. WILLIAM TURNER. Witnesses:

C. E. Lenmar,

W. O. Lamm. 

